It may be the seat of US Government and the nation's capital city, but Washington DC is the most unfaithful place in the America, according to an extra-marital affairs website.

AshleyMaddison.com - a site that married people can log on to to cheat on their partner - has declared Washington 'America's Least faithful city' for the second year running.

The site looked at the number of people logging into the website in 2012 and Washington saw the highest number of people looking for an affair per capita with 34,157 of the city's 632,000 residents registering as new members, according to the Huffington Post.

Naughty: Washington is the most unfaithful city in America according to extra-marital affairs website AshleyMaddison.com

Unfaithful: Washington is not only the seat of Government in the United States, it's also a hotbed for cheating according to new figures. The Capitol Building is pictured

Shamed: News of former CIA boss General David Petraeus' affair rocked Washington last year

Texan cities Austin and Houston came in second and third on the website's list respectively.

But Washington's top spot for cheating shouldn't come as any surprise according to the website's founder Noel Biderman, with the city rocked last year by news that shamed CIA former boss General David Petraeus had an affair with his biographer Paula Broadwell.

He said: 'With enormous public attention paid to political cheating scandals this year, including the General Petraeus affair, there was no doubt that Washington residents would be influenced.